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Isolated DC/DC converters & modules

LM5019

ACTIVE

7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator

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Data sheet

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LM5168 ACTIVE 6-V to 120-V wide VIN, 300-mA DC-DC converter with Fly-Buck™ capability FPWM and PFM mode option and low IQ.

LM5019

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 7.5 Vin (max) (V) 100 Vout (min) (V) 1.25 Vout (max) (V) 90 Iout (max) (A) 0.1 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Synchronous rectification Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (max) (%) 90
Vin (min) (V) 7.5 Vin (max) (V) 100 Vout (min) (V) 1.25 Vout (max) (V) 90 Iout (max) (A) 0.1 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Synchronous rectification Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (max) (%) 90
HSOIC (DDA) 8 29.4 mm² 4.9 x 6 WSON (NGU) 8 16 mm² 4 x 4
  • Wide 7.5-V to 100-V input range
  • Integrated 100-mA high-side and low-side switches
  • No schottky required
  • Constant on-time control
  • No loop compensation required
  • Ultra-fast transient response
  • Nearly constant operating frequency
  • Intelligent peak current limit
  • Adjustable output voltage from 1.225 V
  • Precision 2% feedback reference
  • Frequency adjustable to 1 MHz
  • Adjustable undervoltage lockout
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD
  • Create a custom design using the LM5019 with the WEBENCH Power Designer
  • Wide 7.5-V to 100-V input range
  • Integrated 100-mA high-side and low-side switches
  • No schottky required
  • Constant on-time control
  • No loop compensation required
  • Ultra-fast transient response
  • Nearly constant operating frequency
  • Intelligent peak current limit
  • Adjustable output voltage from 1.225 V
  • Precision 2% feedback reference
  • Frequency adjustable to 1 MHz
  • Adjustable undervoltage lockout
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD
  • Create a custom design using the LM5019 with the WEBENCH Power Designer

The LM5019 is a 100-V, 100-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5019 requires no loop compensation, provides excellent transient response, and enables very low step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high-voltage start-up regulator provides bias power for internal operation of the IC and for integrated gate drivers.

A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout.

The LM5019 device is available in WSON-8 and SO PowerPAD-8 plastic packages.

The LM5019 is a 100-V, 100-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5019 requires no loop compensation, provides excellent transient response, and enables very low step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high-voltage start-up regulator provides bias power for internal operation of the IC and for integrated gate drivers.

A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout.

The LM5019 device is available in WSON-8 and SO PowerPAD-8 plastic packages.
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Technical documentation

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Type Title Date
* Data sheet LM5019 100-V, 100-mA Constant On-Time Synchronous Buck / Fly-Buck™ Regulator datasheet (Rev. H) PDF | HTML 12 Aug 2021
More literature Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML 09 Nov 2022
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Functional safety information LM26420-Q1 Functional Safety FIT Rate and Failure Mode Distribution 17 Feb 2020
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
Application note Powering Drones With a Wide VIN DC-DC Converter (Rev. A) 05 Feb 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Simplifying 100V wide VIN power conversion 11 Nov 2016
Technical article Create a Fly-Buck™ converter in WEBENCH® Power Designer 09 Oct 2015
White paper Designing isolated rails on the fly with Fly-Buck™ converters 29 Sep 2015
Analog Design Journal Fly-Buck(TM) converter provides EMC and isolation in PLC applications 29 Jan 2015
Technical article Fly-Buck: Frequently Asked Questions (FAQs) 05 Jan 2015
Application note AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) 17 Dec 2014
Technical article Powering Bipolar Rails with Wide-VIN Fly-Buck Converter 09 Dec 2014
More literature Fly-Buck™ Solution 19 Nov 2013
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
User guide AN-2204 LM5017 Isolated Supply Evaluation Board (Rev. B) 13 Aug 2013
EVM User's guide AN-2240 LM5019 Isolated Evaluation Board (Rev. A) 30 Apr 2013
User guide LM5019 Buck Evaluation Board (Rev. A) 30 Apr 2013
More literature High-Voltage PoL Power Solutions 30 Jan 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

BOOST-PSEMTHR8-097 — TPS23882 Type-3, 30W, 2-pair, PSE motherboard for 8-port PSE systems

This motherboard is the base board for the PSE Controller ecosystem. The octal channel, TPS23882, IEEE 802.3bt ready PoE PSE controller can be evaluated by using the motherboard (BOOST-PSEMTHR8-097) and TPS23882EVM daughter card (TPS23882EVM-008) (sold separately). The full PoE Evaluation ecosystem (...)
User guide: PDF
Not available on TI.com
Evaluation board

LM5019EVAL — LM5019 Wide Vin Synchronous Buck Regulator Evaluation Board

The LM5019 evaluation board provides the designer with a fully functional buck regulator employing the constant on-time (COT) operating principle. The evaluation board provides a 10V output over an input range of 12.5V to 100V.
User guide: PDF
Not available on TI.com
Evaluation board

LM5019ISOEVAL — LM5019 Isolated Bias Supply Evaluation Board

The LM5019ISOEVAL evaluation board facilitates evaluation of the LM5019 100V, 100mA Constant On-Time Synchronous Buck Regulator. An isolated bias supply is implemented in this evaluation board with the LM5019 the Constant On-Time regulator. The LM5019 regulator integrates both the high and low (...)
User guide: PDF
Not available on TI.com
Simulation model

LM5019 PSpice Transient Model

SNVM045.ZIP (39 KB) - PSpice Model
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Simulation model

LM5019 Unencrypted PSpice Transient Model

SNVMAM4.ZIP (2 KB) - PSpice Model
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Calculation tool

FLYBUCK-FLYBACK-DESIGN-CALC — Fly-Buck and Flyback Topology Selector

This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
Download
Calculation tool

LM5019QUICK-CALC — LM5019 Quick Start Calculator

LM5019 Quick Start Calculator is an easy to use excel based design tool for LM5019 based buck converter design. The design tool has all the design equations embedded and an example default design. The user can modify the design input parameters such as the input voltage range, output voltage, load (...)
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Calculation tool

LM5019 Buck Regulator Quick Start Component Calculator

SNVC056.ZIP (227 KB)
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Reference designs

TIDA-00120 — Solar MPPT Charge Controller Reference Design

This design is a 20A Maximum Power Point Tracking (MPPT) solar charge controller created for solar panel inputs corresponding to 12V and 24V panels. The design is targeted for small and medium power solar charger solutions and is capable of operating with 12V/24V panels and 12V/24V batteries up to (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-01411 — Type 2 PoE PSE, 6kV Lightning Surge Reference Design

This reference design provides lightning surge protection solution for Power over Ethernet (PoE) Power Sourcing Equipment (PSE) systems based on TI's TPS23861 PSE controller. The need for implementing such protection will normally depend on the environment in which the PSE is intended to operate (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP7798 — Low-Power Isolated Supply, Input range: 36V to 75V, Output: 10V @ 120mA, LM5017

Based on the Wide VIN COT Sync Buck regulator LM5017, this FlyBuck circuit provides excellent regulation for two isolated outputs and one non-isolated output. Compared with a conventional Flyback circuit, this design features a smaller board size and minimized BOM without the need for an (...)
Test report: PDF
Schematic: PDF
Package Pins Download
HSOIC (DDA) 8 View options
WSON (NGU) 8 View options
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Ordering & quality

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